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nslookup

Query name server(s) for various domain records.

More information.

Query your system's default name server for an IP address (A record) of the domain:

nslookup {example.com}

Query a given name server for a NS record of the domain:

nslookup -type=NS {example.com} {8.8.8.8}

Query for a reverse lookup (PTR record) of an IP address:

nslookup -type=PTR {54.240.162.118}

Query for ANY available records using TCP protocol:

nslookup -vc -type=ANY {example.com}

Query a given name server for the whole zone file (zone transfer) of the domain using TCP protocol:

nslookup -vc -type=AXFR {example.com} {name_server}

Query for a mail server (MX record) of the domain, showing details of the transaction:

nslookup -type=MX -debug {example.com}

Query a given name server on a specific port number for a TXT record of the domain:

nslookup -port={port_number} -type=TXT {example.com} {name_server}

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